By Jeffrey Goldfarb The author is a Reuters Breakingviews columnist. The opinions expressed are his own. The reformation of Rupert Murdoch looks to have reached its limit. The 81-year-old media mogul has moved to sensibly deploy capital and break up News Corp as part of a big turnaround since a British phone-hacking scandal rocked his empire. But two new board nominees look like the old Murdoch at work. Investors shouldn’t be so quick to forget the havoc an unconstrained emperor can wreak. Poor